Submitted by Mohammad ElKammash

Find the coefficient of \(x^{9}\) in the expansion of \[(2+x)^{10}(1+x)^0+(2+x)^{9}(1+x)+(2+x)^{8}(1+x)^{2}+ \ldots + (2+x)^0(1+x)^{10}.\]

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